题目内容

根据下列材料请回答 36～40 题:
第 36 题 Paul was ordered to pay Clara $600 because

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61%of ulcer risk seems to be caused by

A. unknown factors．
B. economic factors．
C. environmental factors．
D. genetic factors．

Hermann Toplak suggested than more money should be spent on

A. surgery．
B. fat people．
C. preventive programs．
D. state health services．

When a stroke occurs,the arteries leading to and within the brain._______

Up to now，the work has been easy.